the equivalent resistance of the combination is 2.5 ohm
In a parallel circuit, the branches divide the current so that only a portion of it passes through each branch. In a parallel circuit, each branch has the same voltage or potential difference, but the currents may differ. The amount of current flowing through each component in a series circuit is the same. In contrast, the components in parallel circuits are arranged in parallel with one another, which causes the circuit to divide the current flow. Apply the formula of parallel,
1/R=1/R₁+1/R₂+1/R₃
1/R=1/5+1/10+1/15
1/R=7/30+3/30+2/30
1/R=12/30
R=30/12
= 2.5 ohm
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